Add restore resource priorities configuration option

[dymurray]

Investigate if this is still configurable in Velero 1.6. If so, we want to add this as an installation parameter on our Velero CR.

[kaovilai]

Relevant documentation: https://velero.io/docs/v1.6/enable-api-group-versions-feature/#advanced-procedure-for-customizing-the-version-prioritization